Geologia

INTERNATIONAL CHRONOSTRATIGRAPHIC CHART

13.82
15.97
20.44

Ypresian

Danian

56.0
59.2
61.6

Capitanian

66.0

Campanian
83.6 ±0.2
86.3 ±0.5

Turonian
93.9

Cenomanian100.5

Albian
~ 113.0

Aptian
~ 125.0

Lower

Barremian
Hauterivian

~ 129.4
~ 132.9

Valanginian
~ 139.8

Berriasian

~ 145.0

Wordian
Roadian
Kungurian

CisuralianPaleozoic

89.8 ±0.3

Guadalupian

Middle

247.2
251.2
252.2 ±0.5
254.2 ±0.1
259.9 ±0.4
265.1 ±0.4
268.8 ±0.5

Llandovery

Upper

Bashkirian

Upper

Serpukhovian

Middle

423.0±2.3
425.6 ±0.9
427.4 ±0.5
430.5 ±0.7
433.4 ±0.8

Katian

Dapingian

477.7 ±1.4

Stage 10

485.4 ±1.9

Furongian

298.9 ±0.2

Series 3

Jiangshanian
Paibian
Guzhangian
Drumian~ 489.5
~ 494
~ 497
~ 500.5
~ 504.5

Stage 5
~ 509

Stage 4
~ 514

Series 2

~ 521

Stage 2

358.9 ±0.4

GSSP
GSSA

1800

Paleoproterozoic

Orosirian
2050

Rhyacian
2300Siderian
Neoarchean

2500

Mesoarchean
3200

Paleoarchean
3600

Eoarchean

Hadean
~ 4600
Units of all ranks are in the process of being defined by Global
Boundary StratotypeSection and Points (GSSP) for their lower
boundaries, including those of the Archean and Proterozoic, long
defined by Global Standard Stratigraphic Ages (GSSA). Charts
and detailed information onratified GSSPs are available at the
website http://www.stratigraphy.org
Numerical ages are subject to revision and do not define units in
the Phanerozoic and the Ediacaran; only GSSPs do. For boundariesin the Phanerozoic without ratified GSSPs or without constrained
numerical ages, an approximate numerical age (~) is provided.
Numerical ages for all systems except Triassic, Cretaceous andPrecambrian are taken from ‘A Geologic Time Scale 2012’ by
Gradstein et al. (2012); those for the Triassic and Cretaceous were
provided by the relevant ICS subcommissions.

Coloring follows the...